Harley-Davidson's 1993 book, The Legend Begins (TLB), provides production figures, as well as summary descriptions for each year (through 1969), order blanks (through 1957), and a model list (through 1961). These are not always consistent.

TLB states “We are passing this information along to our enthusiasts as a matter of interest, and it is not to be regarded as totally accurate”.

K

KK

KR

KRM

KRTT

KH

KHK

KHR

KHRM

KHRTT

XL

XLH

XLCH

XLC

XLR

XLRTT

XLA

1952

1970

17

a

1953

1723

a

a

1954

a

a

1579

b

1955

37

14

616

449

1

77

6

1956

29

18

539

714

13

1

1957

16

9

90

4

1983

418

1958

9

26

579

711

239

26

1959

10

23

42

947

1059

5

13

1960

a

a

2765

a

1961

a

a

2014

a

1962

a

a

1998

a

1963

80

a

450

975

a

1964

20

30

810

1950

30

100

1965

8

10

955

2815

25

1966

10

10

900

3900

25

1967

2000

2500

1968

1975

4900

1969

2700

5100

Notes:
a - Not listed in TLB, but probable production
b - The Sept 1954 Enthusiast says “KHK again available for 1955”
1953 - TLB does not show KK, assume figure includes them
1958 - TLB does not show XLC, assume figure includes them
1960, 1961, 1962 - TLB does not differentiate XLH/XLCH
1967 - Per TLB, but ratio of XLH:XLCH seems dubious
1967, 1968, 1969 - “Round numbers” given for all models in those years
XLB - TLB does not mention these poorly documented models

You really, really need to own a copy of the wonderful book The Legend Begins.
You can purchase it (part number 99403-93) from your local Harley-Davidson dealer. MSRP is $45.